import { Component, OnInit } from '@angular/core'
import { Router } from '@angular/router'
import { Observable } from 'rxjs/Observable'
import { Subject } from 'rxjs/Subject'
import 'rxjs/add/operator/catch'
import 'rxjs/add/observable/of'
import 'rxjs/add/operator/debounceTime'
import 'rxjs/add/operator/distinctUntilChanged'
import { HeroSearchService } from './hero-search.service'
import { Hero } from './hero'


@Component({
    selector: 'hero-search',
    templateUrl: './hero-search.component.html',
    styleUrls: ['./hero-search.component.css'],
    providers: [HeroSearchService]
})

export class HeroSearchComponent implements OnInit {
    heroes: Observable<Hero[]>;
    private searchTerms = new Subject<string>()

    constructor(
        private heroSearchService: HeroSearchService,
        private router: Router
    ) { }

    search(term: string): void {
        this.searchTerms.next(term)
    }

    ngOnInit(): void {
        this.heroes = this.searchTerms
            .debounceTime(300)
            .distinctUntilChanged()
            .switchMap(term => term ? this.heroSearchService.search(term) : Observable.of<Hero[]>([]))
            .catch(error => {
                console.log(error)
                return Observable.of<Hero[]>([])
            })
    }

    gotoDetail(hero: Hero): void {
        let link = ['/detail', hero.id]
        this.router.navigate(link)
    }
}
